disgruntled
adjective /dɪsˈɡrʌntld/
  /dɪsˈɡrʌntld/
 - annoyed or disappointed because something has happened to upset you
- disgruntled employees
 - disgruntled at/with somebody/something I left feeling disgruntled at the way I'd been treated.
 
Extra ExamplesTopics Feelingsc2- She was rather disgruntled at the way she had been treated.
 - He's feeling very disgruntled with his boss.
 - Some ministers were openly disgruntled with her style of leadership.
 - Police believe it was probably sabotage by a disgruntled employee.
 
Oxford Collocations DictionaryDisgruntled is used with these nouns:- employee
 
Word Originmid 17th cent.: from dis- (as an intensifier) + dialect gruntle ‘utter little grunts’, from grunt.